Group 11 第一周作业提交

group11/1178243325/DataStructure/build.gradle

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+apply plugin: 'java'
+apply plugin: 'eclipse'
+
+jar {
+	manifest {
+		attributes 'Main-Class' : 'com.coding.Main' 
+	}
+}
+
+

group11/1178243325/DataStructure/readme.md

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+实现基本的数据结构ArrayList,LinkList,Stack,Queue,Tree,Iterator

group11/1178243325/DataStructure/src/main/java/com/coding/Main.java

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+package com.coding;
+
+import com.coding.basic.*;
+public class Main {
+	public static void main(String[] args) {
+		ArrayList list = new ArrayList();
+
+		list.add(0, "2xxx");
+		list.add(1, "we");
+		list.add(2, "sss");
+		list.add("xing");
+		list.remove(2);
+		System.out.println(list.get(2));
+		Iterator iterator = list.iterator();
+		while(iterator.hasNext()) {
+			System.out.println(iterator.next());
+		}
+		System.out.println(list.size());
+
+		LinkedList llist = new LinkedList();
+		llist.add("hu");
+		llist.add("zhao");
+		llist.add(2,"xing");
+		llist.addFirst("身骑白马");
+		llist.addLast("德州小老虎");
+		llist.add(5, "sf");
+		llist.remove(5);
+		llist.removeFirst();
+		llist.removeLast();
+		for (int i = 2; i >=0; i--) 
+			System.out.print(llist.get(i));
+		System.out.println(llist.size());
+
+		Iterator literator = llist.iterator();
+		while(literator.hasNext()) {
+			System.out.println(literator.next());
+		}
+
+		Stack stack = new Stack();
+		stack.push(1);
+		stack.push(2);
+		stack.push(3);
+		stack.push(4);
+		System.out.println(stack.peek());
+		while(!stack.isEmpty())	
+		System.out.println(stack.pop());
+
+		Queue queue = new Queue();
+		queue.enQueue(1);
+		queue.enQueue(2);
+		queue.enQueue(3);
+		System.out.println(queue.size());
+		while (!queue.isEmpty()) {
+			System.out.println(queue.deQueue());
+		}
+
+	}
+}

group11/1178243325/DataStructure/src/main/java/com/coding/basic/ArrayList.java

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+package com.coding.basic;
+
+import com.coding.basic.exception.*;
+public class ArrayList implements List {
+
+	private int size;
+	private Object[] elementData;
+
+	public ArrayList () {
+		size = 0;
+		elementData = new Object[100];
+	}
+
+	public void add(Object o){
+		add(size(), o);
+	}
+
+	public void add(int index, Object o){
+		if (size() == elementData.length)	
+			ensureCapacity( size() * 2 + 1);
+		if (index > size() || index < 0) { //index == size时相当于在尾后插入
+			throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
+		}
+		for (int i = size; i > index; i--) {
+			elementData[i] = elementData[i-1]; 
+		}
+		elementData[index] = o; 
+		size++;
+
+	}
+
+	private void ensureCapacity(int newCapacity) {
+		if (newCapacity < size())
+			return;
+		Object[] old = elementData;
+		elementData = new Object[newCapacity];
+		for (int i = 0; i < size(); i++) {
+			elementData[i] = old[i];
+		}
+	}
+
+	public Object get(int index){
+		if (index >= size() || index < 0) { //获取时,index==size()越界
+			throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
+		}	
+		return elementData[index];
+	}
+
+	private String outOfBoundsMsg(int index) {
+		return "Index:" + index + ", Size:" + size; 
+	}
+
+	public Object remove(int index){
+		if (index >= size() || index < 0) {
+			throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
+		}
+		Object old = elementData[index];
+		for (int i = index; i < size(); i++) {
+			elementData[i] = elementData[i+1];
+		}
+		size--;
+		return old;
+	}
+
+	/*获取表内容量*/
+	public int size(){
+		return size;
+	}
+
+	public Iterator iterator(){
+		return new ArrayListIterator();
+	}
+
+	public class ArrayListIterator implements Iterator {
+		private final int ONLY_CAPACITY = size;
+		private int index;
+		public ArrayListIterator() {
+			index = 0;
+		}
+
+		@Override
+		public boolean hasNext() {
+			if (ONLY_CAPACITY != size)
+				throw new ConcurrentModificationException("此对象没有进行修改同步");
+			return index != size;	
+		}
+
+		@Override
+		public Object next() {
+			if (ONLY_CAPACITY != size)
+				throw new ConcurrentModificationException("此对象没有进行修改同步");
+			if (index >= ONLY_CAPACITY)
+				throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
+			return elementData[index++];
+		}
+	}
+}

group11/1178243325/DataStructure/src/main/java/com/coding/basic/BinaryTreeNode.java

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+package com.coding.basic;
+
+public class BinaryTreeNode {
+
+	private Object data;
+	private BinaryTreeNode left;
+	private BinaryTreeNode right;
+
+	public Object getData() {
+		return data;
+	}
+	public void setData(Object data) {
+		this.data = data;
+	}
+	public BinaryTreeNode getLeft() {
+		return left;
+	}
+	public void setLeft(BinaryTreeNode left) {
+		this.left = left;
+	}
+	public BinaryTreeNode getRight() {
+		return right;
+	}
+	public void setRight(BinaryTreeNode right) {
+		this.right = right;
+	}
+
+	public BinaryTreeNode insert(Object o){
+		return  null;
+	}
+
+}

group11/1178243325/DataStructure/src/main/java/com/coding/basic/Iterator.java

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+package com.coding.basic;
+
+public interface Iterator {
+	public boolean hasNext();
+	public Object next();
+}

group11/1178243325/DataStructure/src/main/java/com/coding/basic/LinkedList.java

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+package com.coding.basic;
+
+import com.coding.basic.exception.*;
+public class LinkedList implements List {
+
+	private Node head;
+	private int size;
+	public LinkedList() {
+		head = new Node(null, null);	
+		size = 0;
+	}
+
+	public void add(Object o){
+		add(size, o);		
+	}
+
+	public void add(int index , Object o){
+		if (index > size || index < 0) {
+			throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
+		}
+		Node frontNode = getNode(index-1);
+		Node newNode = new Node(o, frontNode.next);		
+		frontNode.next = newNode;
+		size++;
+
+	}
+
+	private Node getNode(int index) {
+		Node node = head;
+		int i = 0;
+		while(node.next != null && i <= index) {
+			node = node.next;
+			i++;
+		}
+		return node;
+	}
+
+	public Object get(int index){
+		if (index >= size || index < 0) {
+			throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
+		}
+
+		Node node = getNode(index);	
+		return node.data;
+	}
+
+	public Object remove(int index){
+		if (index >= size || index < 0) {
+			throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
+		}
+		Node frontNode = getNode(index-1);
+		Node oldNode = getNode(index);
+		frontNode.next = oldNode.next;
+		size--;
+		return oldNode.data;
+	}
+
+	public int size(){
+		return size;
+	}
+
+	public void addFirst(Object o){
+		//就是这么硬!
+		add(0, o);
+	}
+
+	public void addLast(Object o){
+		add(size, o);
+	}
+
+	public Object removeFirst(){
+		return remove(0);
+	}
+
+	public Object removeLast(){
+		return remove(size-1);
+	}
+
+	public Iterator iterator(){
+		return new LinkedListIterator();
+	}
+
+	private class LinkedListIterator implements Iterator {
+		int index;
+		final int capacity = size;
+		LinkedListIterator() {
+			index = 0;
+		}
+		@Override
+		public boolean hasNext() {
+			if (capacity != size)
+				throw new ConcurrentModificationException("此对象没有修改同步");
+			return index < capacity;	
+		}
+
+		@Override 
+		public Object next() {
+			if (capacity != size)
+				throw new ConcurrentModificationException("此对象没有修改同步");
+			if (index >= capacity)
+				throw new IndexOutOfBoundsException(outOfBoundsMsg(index));
+			return get(index++);	
+		}
+	}
+
+	private String outOfBoundsMsg(int index) {
+		return "index:" + index + ", size:" + size;
+	}	
+
+	private static  class Node {
+		Object data;
+		Node next;
+
+		Node(Object data, Node next) {
+			this.data = data;
+			this.next = next;
+		}
+
+		void setData(Object data) {
+			this.data = data;	
+		}
+
+		Object getData() {
+			return data; 
+		}
+
+		void setNext(Node next) {
+			this.next = next;
+		}
+
+		Object getNext() {
+			return next;
+		}
+	}
+}

group11/1178243325/DataStructure/src/main/java/com/coding/basic/List.java

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+package com.coding.basic;
+
+public interface List {
+	public void add(Object o);
+	public void add(int index, Object o);
+	public Object get(int index);
+	public Object remove(int index);
+	public int size();
+}

group11/1178243325/DataStructure/src/main/java/com/coding/basic/Queue.java

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+package com.coding.basic;
+import com.coding.basic.exception.*;
+public class Queue {
+
+	private LinkedList elementData;
+
+	public Queue() {
+		elementData = new LinkedList();
+	}
+
+	public void enQueue(Object o){		
+		elementData.addLast(o);		
+	}
+
+	public Object deQueue(){
+		if (isEmpty()) {
+			throw new EmptyQueueException("队空"); 
+		}
+		Object result = elementData.removeFirst();
+		return result;
+	}
+
+	public boolean isEmpty(){
+		return elementData.size() == 0;
+	}
+
+	public int size(){
+		return elementData.size();
+	}
+}